Income Taxes (Reconciliation Of Income Tax Expense Computed At The Statutory Federal Income Tax Rate) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Amount at statutory rate, amount	$ 1,344.1	$ 1,350.4	$ 1,385.3
Amount at statutory rate, percent	35.00%	35.00%	35.00%
State and local income taxes net of federal tax benefit, amount	24.4	25.5	42.3
State and local income taxes net of federal tax benefit, percent	0.60%	0.60%	1.10%
Tax exempt interest and dividends received deduction, amount	(64.9)	(59.3)	(58.6)
Tax exempt interest and dividends received deduction, percent	(1.70%)	(1.50%)	(1.50%)
Audit settlements, amount	0	(200.5)	(49.7)
Audit settlements, percent	0.00%	(5.20%)	(1.30%)
Other, net amount	(97.7)	91.2	(8.1)
Other, net percent	(2.50%)	2.40%	(0.20%)
Total income tax expense	$ 1,205.9	$ 1,207.3	$ 1,311.2
Total income tax expense, percent	31.40%	31.30%	33.10%